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A star is a luminous spheroid of plasma held together by self-gravity. [1] The nearest star to Earth is the Sun.Many other stars are visible to the naked eye at night; their immense distances from Earth make them appear as fixed points of light.
At least four of the fifteen stars visible to the unaided eye are orange giants of spectral class K. [20] The second brightest star in the constellation—at apparent magnitude 4.1—is Zeta Telescopii, an orange subgiant of spectral type K1III-IV. [21] Around 1.53 times as massive as the Sun, it shines with 512 times its luminosity. [22]
The stars of the Triangle are in the band of the Milky Way which marks the galactic equator, and are in the direction of the Galactic Center. The Winter Triangle is visible in the northern sky's winter and comprises the first magnitude stars Betelgeuse, Sirius and Procyon (the second and fourth closest star or star system visible without aid).
In 2016, the International Astronomical Union (IAU) organized a Working Group on Star Names (WGSN) [2] to catalog and standardize proper names for stars. The WGSN's first bulletin, dated July 2016, [3] included a table of 125 stars comprising the first two batches of names approved by the WGSN (on 30 June and 20 July 2016) together with names of stars adopted by the IAU Executive Committee ...
Paranal Observatory nights. [3] The concept of noctcaelador tackles the aesthetic perception of the night sky. [4]Depending on local sky cloud cover, pollution, humidity, and light pollution levels, the stars visible to the unaided naked eye appear as hundreds, thousands or tens of thousands of white pinpoints of light in an otherwise near black sky together with some faint nebulae or clouds ...
The number used to identify stars in navigation publications and star charts. [Note 2] Common name The name of the star commonly used navigation publications and star charts. Bayer designation: Another name of the star which combines a Greek letter with the possessive form of its constellation's Latin name. Etymology of common name
It includes all stars brighter than magnitude +2.50 in visible light, measured using a V-band filter in the UBV photometric system. Stars in binary systems (or other multiples ) are listed by their total or combined brightness if they appear as a single star to the naked eye , or listed separately if they do not.
Often they contain star clusters within them. The stars appear closely packed, but are not usually part of any structure. [17] Within the Milky Way, star clouds show through gaps between dust clouds of the Great Rift, allowing deeper views along our particular line of sight. [18] Star clouds have also been identified in other nearby galaxies. [19]
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